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22f110db28
The free() was added in the wrong assumption that xargs was not freeing the argument in the position replaced, but it actually does it. Also, removing the call to free() makes more general the function.
62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/*
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* Copyright (c) 2002 J. Mallett. All rights reserved.
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* You may do whatever you want with this file as long as
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* the above copyright and this notice remain intact, along
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* with the following statement:
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* For the man who taught me vi, and who got too old, too young.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../util.h"
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/*
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* Replaces str with a string consisting of str with match replaced with
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* replstr as many times as can be done before the constructed string is
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* maxsize bytes large. It does not free the string pointed to by str, it
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* is up to the calling program to be sure that the original contents of
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* str as well as the new contents are handled in an appropriate manner.
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* If replstr is NULL, then that internally is changed to a nil-string, so
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* that we can still pretend to do somewhat meaningful substitution.
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* No value is returned.
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*/
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void
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strnsubst(char **str, const char *match, const char *replstr, size_t maxsize)
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{
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char *s1, *s2, *this;
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size_t matchlen, s2len;
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int n;
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if ((s1 = *str) == NULL)
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return;
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s2 = emalloc(maxsize);
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if (replstr == NULL)
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replstr = "";
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if (match == NULL || *match == '\0' || strlen(s1) >= maxsize) {
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strlcpy(s2, s1, maxsize);
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goto done;
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}
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*s2 = '\0';
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s2len = 0;
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matchlen = strlen(match);
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for (;;) {
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if ((this = strstr(s1, match)) == NULL)
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break;
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n = snprintf(s2 + s2len, maxsize - s2len, "%.*s%s",
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(int)(this - s1), s1, replstr);
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if (n == -1 || n + s2len + strlen(this + matchlen) >= maxsize)
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break; /* out of room */
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s2len += n;
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s1 = this + matchlen;
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}
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strlcpy(s2 + s2len, s1, maxsize - s2len);
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done:
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*str = s2;
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return;
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}
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